Citroen DS5 power loss ECU error

I'm having an issue with my 2018 Citroen DS5 diesel. It has about 114741 km. I've noticed a big drop in engine power, and a diagnostic check showed an error code. I'm wondering if it could be the ECU. Has anyone else had similar issues or know what might cause this?

4 comment(s)

Hey, I had something similar with my DS5. Reduced power and an ECU error. Turned out to be a faulty main relay. Might be worth checking out before you go down the rabbit hole of full ECU replacement. Saved me a fortune!

Thanks for the info. Can you tell me more about how to check the main relay? I don't know much about car electronics, but I'm willing to look into it before going to a mechanic.

I'm no expert, but the workshop guys found it fast using diagnostics. They said something about inconsistent voltage readings to the ECU. Honestly, unless you're good with a multimeter and wiring diagrams, it’s best to let a professional check it. Could save you from frying something expensive!

Thanks for the advice. I had a mechanic inspect the main relay, and they confirmed it was defective. The repair cost 120€.

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